Please note that the following size charts are for average (approximate) sizes of dogs, and that dogs vary according to age, breed, bone-structure, and even fur/hair density.

Oscar Newman sweaters, t-shirts, and hoodies are cut longer than most other brands, and are designed to cover the dog more fully to the base of the tail. Sweaters, t-shirts, and hoodies tend to allow for variances, as they are made of stretchable material.